hard freeze warning for the sacramento valley, also solano county. could see upper teens to mid-20s by tomorrow morning. the culprit is a real drop in the jet stream. it's allowing this cold air which is usually damned up east of the cascades to spill all the way down into california. this pattern's going to stick around at least until about monday. notice how quickly we reach freezing in the bay area. by midnight, already in the north and east bay valleys, pretty close to 30 degrees. and then purple on the map or darker blues indicating some 20s out towards solano county, the east bay, areas south of san jose and likely north bay. look at san francisco. low to mid-30s even around the water. so mostly clear skies tonight. of course, that's going to help our temperatures to drop off. and during the day tomorrow, sunshine but it's going to be really quite cold. as you can see, our high temperatures again tomorrow, upper 40s to near 50 to wrap up the weekend. 49 around milpitas. around the east bay, highs low 50s and upper 40s. and for the north bay, hi